6 DEPARTMENT OF AGRICULTURE BULS. 126— *75Q. 



Department Bulletin No. 737. — The Tobacco Beetle: An Important 



Pest in Tobacco Products — Continued. Page. 



Natural control 30 



Remedial measures 37 



Preventive measures 53 



Summary and recommendations 68 



Bibliography 69 



Department Bulletin No. 738.— Effect of Grazing upon Western Yel- 

 low Pine Reproduction in Central Idaho: 



Timber and live stock 1 



Studies made on three grazing allotments 2 



The Deadwood allotment 3 



The Silver Creek allotment 4 



The South Fork allotment 5 



Method of study 5 



Injuries to reproduction caused by sheep grazing 6 



Nature of injuries 6 



Amount of damage 7 



Sizes injured 12 



Season of injury 14 



Relation between amount of damage and intensity of grazing 15 



Cumulative effect of grazing 18 



Relation between amount of damage and amount and character of forage 19 



Comparison of the damage caused by sheep and other agencies 19 



Valuation of damage 22 



Benefits of sheep grazing to the forest 25 



Aid to reproduction 25 



Protection against fire 27 



Management of grazing 27 



Time to graze 27 



Intensity of grazing ". 28 



Methods of handling 28 



Department Bulletin No. 739. — The Significance of the Colon Count 

 in Raw Milk: 



Present status of the question 1 



Do organisms of the colon-aerogenes group indicate the presence of manure 



in fresh milk? 3 



Can milk be produced commercially without contamination by organisms 



of the colon-aerogenes group? 9 



How many organisms of the colon-aerogenes group can be introduced into 



milk during milking? 12 



Why are high colon counts often found in raw milk? "" 19 



Are both the B. coli and B. aerogenes types present in milk, and if so is 



their relative proportion of any value? 27 



Has the colon count any significance in raw milk? 31 



Summary 32 



Literature cited 33 



Department Bulletin No. 740. — A Study of Some of the Chemical 

 Changes which Occur in Oysters During Their Preparation for 

 Market: 



Scope of investigation 1 



Commercial treatment of oysters 2 



Experimental work 3 



Methods of analysis 3 



Summary 23 



Department Bulletin No. 741.— Effect of Grazing upon Aspen Repro- 

 duction: 



Purpose of the bulletin 1 



Method 2 



Injury to aspen reproduction by live stock in standing timber 3 



Effect of sheep browsing 3 



Effect of cattle browsing 9 



Injury to aspen reproduction by grazing on clear-cut lands 10 



Effect of sheep browsing 10 



Effect of cattle browsing 15- 



